export default {
  namespaced: true,
  state: () => ({
    cart: JSON.parse(uni.getStorageSync('cart') || '[]'),
  }),
  mutations: {
    addToCart(state, goods) {
          const findResult = state.cart.find((x) => x.goods_id === goods.goods_id)
          if (!findResult) {
            state.cart.push(goods)
          } else {
            findResult.goods_count++
          }
           this.commit('m_cart/saveToStorage')
        },
    saveToStorage(state) {
           uni.setStorageSync('cart', JSON.stringify(state.cart))
        },
    updateGoodsState(state, goods) {
          const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
          if (findResult) {
            findResult.goods_state = goods.goods_state
            this.commit('m_cart/saveToStorage')
          }
        },
    updateGoodsCount(state, goods) {
          const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
          if(findResult) {
            findResult.goods_count = goods.goods_count
            this.commit('m_cart/saveToStorage')
          }
        },
    removeGoodsById(state, goods_id) {
          state.cart = state.cart.filter(x => x.goods_id !== goods_id)
          this.commit('m_cart/saveToStorage')
        },
    updateAllGoodsState(state, newState) {
          state.cart.forEach(x => x.goods_state = newState)
          this.commit('m_cart/saveToStorage')
    }
  },
  getters: {
    total(state) {
          let c = 0
          state.cart.forEach(goods => c += goods.goods_count)
          return c
       },
    checkedCount(state) {
         return state.cart.filter(x => x.goods_state)
         .reduce((total, item) => total += item.goods_count, 0)
    },
    checkedGoodsAmount(state) {
      return state.cart.filter(x => x.goods_state)
                       .reduce((total, item) => total += item.goods_count * item.goods_price, 0)
                       .toFixed(2)
    }
  },
}